Vitamin A deficiency

This trial tests whether giving a single high dose of vitamin A before an allogeneic stem cell transplant can reduce the chance of developing moderate-to-severe chronic graft-versus-host disease (GVHD), a common and serious complication. Adults scheduled for a stem cell transplan…

This study tests whether injecting a person's own bone marrow stem cells into or near the eye can help treat various retinal and optic nerve diseases, including age-related macular degeneration, retinitis pigmentosa, and glaucoma. Participants receive stem cell injections via dif…

This study tests whether giving vitamin A supplements to children with low vitamin A levels can slow the worsening of scoliosis (curved spine). The trial will include 140 children aged 6 to 15 who have mild to moderate scoliosis and are still growing. Half will get vitamin A plus…

This study tests whether phentolamine eye drops can improve vision in low light for people who had laser eye surgery and now see glare, halos, or starbursts at night. About 200 adults will use the drops or a placebo every evening for two weeks. The main goal is to see if more peo…

This study aims to understand what causes Visual Snow Syndrome (VSS), a condition where people see constant flickering dots across their vision. Researchers will use brain scans and visual tests to find which brain pathways are involved. About 100 adults with VSS, migraine, or he…